]> git.lyx.org Git - lyx.git/blobdiff - src/Buffer.cpp
Initializing the gui_ member of the cloned buffer has strange side effects
[lyx.git] / src / Buffer.cpp
index 3eae06e13c0f0e8aab399ed5bfecbf17e652738a..ce174381f700ca625a80fc78cbbceda73e791d75 100644 (file)
@@ -66,7 +66,6 @@
 #include "WordLangTuple.h"
 #include "WordList.h"
 
-#include "insets/InsetBibitem.h"
 #include "insets/InsetBibtex.h"
 #include "insets/InsetBranch.h"
 #include "insets/InsetInclude.h"
@@ -128,7 +127,7 @@ namespace {
 
 // Do not remove the comment below, so we get merge conflict in
 // independent branches. Instead add your own.
-int const LYX_FORMAT = 404; // rgh: refstyle
+int const LYX_FORMAT = 413; // rgh: html_css_as_file
 
 typedef map<string, bool> DepClean;
 typedef map<docstring, pair<InsetLabel const *, Buffer::References> > RefCache;
@@ -189,7 +188,7 @@ public:
        /// is autosave needed?
        mutable bool bak_clean;
 
-       /// is this a unnamed file (New...)?
+       /// is this an unnamed file (New...)?
        bool unnamed;
 
        /// buffer is r/o
@@ -414,9 +413,8 @@ Buffer::~Buffer()
                        from_utf8(d->temppath.absFileName())));
        }
 
-       // Remove any previewed LaTeX snippets associated with this buffer.
        if (!isClone())
-               thePreviews().removeLoader(*this);
+               removePreviews();
 
        delete d;
 }
@@ -643,10 +641,11 @@ void Buffer::setReadonly(bool const flag)
 }
 
 
-void Buffer::setFileName(string const & newfile)
+void Buffer::setFileName(FileName const & fname)
 {
-       d->filename = makeAbsPath(newfile);
+       d->filename = fname;
        setReadonly(d->filename.isReadOnly());
+       saveCheckSum();
        updateTitles();
 }
 
@@ -673,7 +672,7 @@ int Buffer::readHeader(Lexer & lex)
        params().headsep.erase();
        params().footskip.erase();
        params().columnsep.erase();
-       params().fontsCJK.erase();
+       params().fonts_cjk.erase();
        params().listings_params.clear();
        params().clearLayoutModules();
        params().clearRemovedModules();
@@ -754,15 +753,15 @@ bool Buffer::readDocument(Lexer & lex)
        ErrorList & errorList = d->errorLists["Parse"];
        errorList.clear();
 
+       // remove dummy empty par
+       paragraphs().clear();
+
        if (!lex.checkFor("\\begin_document")) {
                docstring const s = _("\\begin_document is missing");
                errorList.push_back(ErrorItem(_("Document header error"),
                        s, -1, 0, 0));
        }
 
-       // we are reading in a brand new document
-       LASSERT(paragraphs().empty(), /**/);
-
        readHeader(lex);
 
        if (params().outputChanges) {
@@ -821,6 +820,14 @@ bool Buffer::readDocument(Lexer & lex)
        // read main text
        bool const res = text().read(lex, errorList, d->inset);
 
+       // inform parent buffer about local macros
+       if (parent()) {
+               Buffer const * pbuf = parent();
+               UserMacroSet::const_iterator cit = usermacros.begin();
+               UserMacroSet::const_iterator end = usermacros.end();
+               for (; cit != end; ++cit)
+                       pbuf->usermacros.insert(*cit);
+       }
        usermacros.clear();
        updateMacros();
        updateMacroInstances();
@@ -832,44 +839,67 @@ bool Buffer::readString(string const & s)
 {
        params().compressed = false;
 
-       // remove dummy empty par
-       paragraphs().clear();
        Lexer lex;
        istringstream is(s);
        lex.setStream(is);
-       FileName const name = FileName::tempName("Buffer_readString");
-       switch (readFile(lex, name, true)) {
-       case failure:
-               return false;
-       case wrongversion: {
+       FileName const fn = FileName::tempName("Buffer_readString");
+
+       int file_format;
+       ReadStatus const ret_plf = parseLyXFormat(lex, fn, file_format);
+       if (ret_plf != ReadSuccess)
+               return ret_plf;
+
+       if (file_format != LYX_FORMAT) {
                // We need to call lyx2lyx, so write the input to a file
-               ofstream os(name.toFilesystemEncoding().c_str());
+               ofstream os(fn.toFilesystemEncoding().c_str());
                os << s;
                os.close();
-               return readFile(name);
-       }
-       case success:
-               break;
+               // lyxvc in readFile
+               return readFile(fn) == ReadSuccess;
        }
 
+       if (readDocument(lex))
+               return false;
        return true;
 }
 
 
-bool Buffer::readFile(FileName const & filename)
+Buffer::ReadStatus Buffer::readFile(FileName const & fn)
 {
-       FileName fname(filename);
-
-       params().compressed = fname.isZippedFile();
-
-       // remove dummy empty par
-       paragraphs().clear();
+       FileName fname(fn);
        Lexer lex;
        lex.setFile(fname);
-       if (readFile(lex, fname) != success)
-               return false;
 
-       return true;
+       int file_format;
+       ReadStatus const ret_plf = parseLyXFormat(lex, fn, file_format);
+       if (ret_plf != ReadSuccess)
+               return ret_plf;
+
+       if (file_format != LYX_FORMAT) {
+               FileName tmpFile;
+               ReadStatus const ret_clf = convertLyXFormat(fn, tmpFile, file_format);
+               if (ret_clf != ReadSuccess)
+                       return ret_clf;
+               return readFile(tmpFile);
+       }
+
+       // FIXME: InsetInfo needs to know whether the file is under VCS 
+       // during the parse process, so this has to be done before.
+       lyxvc().file_found_hook(d->filename);
+
+       if (readDocument(lex)) {
+               Alert::error(_("Document format failure"),
+                       bformat(_("%1$s ended unexpectedly, which means"
+                               " that it is probably corrupted."),
+                                       from_utf8(fn.absFileName())));
+               return ReadDocumentFailure;
+       }
+
+       d->file_fully_loaded = true;
+       d->read_only = !d->filename.isWritable();
+       params().compressed = d->filename.isZippedFile();
+       saveCheckSum();
+       return ReadSuccess;
 }
 
 
@@ -885,123 +915,125 @@ void Buffer::setFullyLoaded(bool value)
 }
 
 
-Buffer::ReadStatus Buffer::readFile(Lexer & lex, FileName const & filename,
-               bool fromstring)
+void Buffer::updatePreviews() const
+{
+       if (graphics::Previews::status() != LyXRC::PREVIEW_OFF)
+               thePreviews().generateBufferPreviews(*this);
+}
+
+
+void Buffer::removePreviews() const
 {
-       LASSERT(!filename.empty(), /**/);
+       thePreviews().removeLoader(*this);
+}
+
 
-       // the first (non-comment) token _must_ be...
-       if (!lex.checkFor("\\lyxformat")) {
+Buffer::ReadStatus Buffer::parseLyXFormat(Lexer & lex,
+       FileName const & fn, int & file_format) const
+{
+       if(!lex.checkFor("\\lyxformat")) {
                Alert::error(_("Document format failure"),
-                            bformat(_("%1$s is not a readable LyX document."),
-                                      from_utf8(filename.absFileName())));
-               return failure;
-       }
+                       bformat(_("%1$s is not a readable LyX document."),
+                               from_utf8(fn.absFileName())));
+               return ReadNoLyXFormat;
+       }       
 
        string tmp_format;
        lex >> tmp_format;
-       //lyxerr << "LyX Format: `" << tmp_format << '\'' << endl;
-       // if present remove ".," from string.
+
+       // LyX formats 217 and earlier were written as 2.17. This corresponds
+       // to files from LyX versions < 1.1.6.3. We just remove the dot in
+       // these cases. See also: www.lyx.org/trac/changeset/1313.
        size_t dot = tmp_format.find_first_of(".,");
-       //lyxerr << "           dot found at " << dot << endl;
        if (dot != string::npos)
-                       tmp_format.erase(dot, 1);
-       int const file_format = convert<int>(tmp_format);
-       //lyxerr << "format: " << file_format << endl;
-
-       // save timestamp and checksum of the original disk file, making sure
-       // to not overwrite them with those of the file created in the tempdir
-       // when it has to be converted to the current format.
-       if (!d->checksum_) {
-               // Save the timestamp and checksum of disk file. If filename is an
-               // emergency file, save the timestamp and checksum of the original lyx file
-               // because isExternallyModified will check for this file. (BUG4193)
-               string diskfile = filename.absFileName();
-               if (suffixIs(diskfile, ".emergency"))
-                       diskfile = diskfile.substr(0, diskfile.size() - 10);
-               saveCheckSum(FileName(diskfile));
-       }
+               tmp_format.erase(dot, 1);
 
-       if (file_format != LYX_FORMAT) {
+       file_format = convert<int>(tmp_format);
+       return ReadSuccess;
+}
 
-               if (fromstring)
-                       // lyx2lyx would fail
-                       return wrongversion;
-
-               FileName const tmpfile = FileName::tempName("Buffer_readFile");
-               if (tmpfile.empty()) {
-                       Alert::error(_("Conversion failed"),
-                                    bformat(_("%1$s is from a different"
-                                             " version of LyX, but a temporary"
-                                             " file for converting it could"
-                                             " not be created."),
-                                             from_utf8(filename.absFileName())));
-                       return failure;
-               }
-               FileName const lyx2lyx = libFileSearch("lyx2lyx", "lyx2lyx");
-               if (lyx2lyx.empty()) {
-                       Alert::error(_("Conversion script not found"),
-                                    bformat(_("%1$s is from a different"
-                                              " version of LyX, but the"
-                                              " conversion script lyx2lyx"
-                                              " could not be found."),
-                                              from_utf8(filename.absFileName())));
-                       return failure;
-               }
-               ostringstream command;
-               command << os::python()
-                       << ' ' << quoteName(lyx2lyx.toFilesystemEncoding())
-                       << " -t " << convert<string>(LYX_FORMAT)
-                       << " -o " << quoteName(tmpfile.toFilesystemEncoding())
-                       << ' ' << quoteName(filename.toSafeFilesystemEncoding());
-               string const command_str = command.str();
-
-               LYXERR(Debug::INFO, "Running '" << command_str << '\'');
-
-               cmd_ret const ret = runCommand(command_str);
-               if (ret.first != 0) {
-                       if (file_format < LYX_FORMAT)
-                               Alert::error(_("Conversion script failed"),
-                                    bformat(_("%1$s is from an older version"
-                                             " of LyX, but the lyx2lyx script"
-                                             " failed to convert it."),
-                                             from_utf8(filename.absFileName())));
-                       else
-                               Alert::error(_("Conversion script failed"),
-                                    bformat(_("%1$s is from a newer version"
-                                             " of LyX and cannot be converted by the"
-                                                               " lyx2lyx script."),
-                                             from_utf8(filename.absFileName())));
-                       return failure;
-               } else {
-                       bool const ret = readFile(tmpfile);
-                       // Do stuff with tmpfile name and buffer name here.
-                       return ret ? success : failure;
-               }
 
+Buffer::ReadStatus Buffer::convertLyXFormat(FileName const & fn, 
+       FileName & tmpfile, int from_format)
+{
+       tmpfile = FileName::tempName("Buffer_convertLyXFormat");
+       if(tmpfile.empty()) {
+               Alert::error(_("Conversion failed"),
+                       bformat(_("%1$s is from a different"
+                               " version of LyX, but a temporary"
+                               " file for converting it could"
+                               " not be created."),
+                               from_utf8(fn.absFileName())));
+               return LyX2LyXNoTempFile;
        }
 
-       if (readDocument(lex)) {
-               Alert::error(_("Document format failure"),
-                            bformat(_("%1$s ended unexpectedly, which means"
-                                                   " that it is probably corrupted."),
-                                      from_utf8(filename.absFileName())));
-               return failure;
+       FileName const lyx2lyx = libFileSearch("lyx2lyx", "lyx2lyx");
+       if (lyx2lyx.empty()) {
+               Alert::error(_("Conversion script not found"),
+                    bformat(_("%1$s is from a different"
+                              " version of LyX, but the"
+                              " conversion script lyx2lyx"
+                              " could not be found."),
+                              from_utf8(fn.absFileName())));
+               return LyX2LyXNotFound;
        }
 
-       d->file_fully_loaded = true;
-       return success;
+       // Run lyx2lyx:
+       //   $python$ "$lyx2lyx$" -t $LYX_FORMAT$ -o "$tempfile$" "$filetoread$"
+       ostringstream command;
+       command << os::python()
+               << ' ' << quoteName(lyx2lyx.toFilesystemEncoding())
+               << " -t " << convert<string>(LYX_FORMAT)
+               << " -o " << quoteName(tmpfile.toFilesystemEncoding())
+               << ' ' << quoteName(fn.toSafeFilesystemEncoding());
+       string const command_str = command.str();
+
+       LYXERR(Debug::INFO, "Running '" << command_str << '\'');
+
+       cmd_ret const ret = runCommand(command_str);
+       if (ret.first != 0) {
+               if (from_format < LYX_FORMAT) {
+                       Alert::error(_("Conversion script failed"),
+                               bformat(_("%1$s is from an older version"
+                                       " of LyX and the lyx2lyx script"
+                                       " failed to convert it."),
+                                       from_utf8(fn.absFileName())));
+                       return LyX2LyXOlderFormat;
+               } else {
+                       Alert::error(_("Conversion script failed"),
+                               bformat(_("%1$s is from a newer version"
+                                       " of LyX and the lyx2lyx script"
+                                       " failed to convert it."),
+                                       from_utf8(fn.absFileName())));
+                       return LyX2LyXNewerFormat;
+               }
+       }
+       return ReadSuccess;
 }
 
 
 // Should probably be moved to somewhere else: BufferView? GuiView?
 bool Buffer::save() const
 {
+       docstring const file = makeDisplayPath(absFileName(), 20);
+       d->filename.refresh();
+
+       // check the read-only status before moving the file as a backup
+       if (d->filename.exists()) {
+               bool const read_only = !d->filename.isWritable();
+               if (read_only) {
+                       Alert::warning(_("File is read-only"),
+                               bformat(_("The file %1$s cannot be written because it "
+                               "is marked as read-only."), file));
+                       return false;
+               }
+       }
+
        // ask if the disk file has been externally modified (use checksum method)
        if (fileName().exists() && isExternallyModified(checksum_method)) {
-               docstring const file = makeDisplayPath(absFileName(), 20);
-               docstring text = bformat(_("Document %1$s has been externally modified. Are you sure "
-                                                            "you want to overwrite this file?"), file);
+               docstring text = 
+                       bformat(_("Document %1$s has been externally modified. "
+                               "Are you sure you want to overwrite this file?"), file);
                int const ret = Alert::prompt(_("Overwrite modified file?"),
                        text, 1, 1, _("&Overwrite"), _("&Cancel"));
                if (ret == 1)
@@ -1023,13 +1055,18 @@ bool Buffer::save() const
                        backupName = FileName(addName(lyxrc.backupdir_path,
                                                      mangledName));
                }
-               // do not copy because of #6587
-               if (fileName().moveTo(backupName)) {
-                       madeBackup = true;
-               } else {
+
+               // Except file is symlink do not copy because of #6587.
+               // Hard links have bad luck.
+               if (fileName().isSymLink())
+                       madeBackup = fileName().copyTo(backupName);
+               else
+                       madeBackup = fileName().moveTo(backupName);
+
+               if (!madeBackup) {
                        Alert::error(_("Backup failure"),
                                     bformat(_("Cannot create backup file %1$s.\n"
-                                              "Please check whether the directory exists and is writeable."),
+                                              "Please check whether the directory exists and is writable."),
                                             from_utf8(backupName.absFileName())));
                        //LYXERR(Debug::DEBUG, "Fs error: " << fe.what());
                }
@@ -1076,7 +1113,7 @@ bool Buffer::writeFile(FileName const & fname) const
        // see bug 6587
        // removeAutosaveFile();
 
-       saveCheckSum(d->filename);
+       saveCheckSum();
        message(str + _(" done."));
 
        return true;
@@ -1102,10 +1139,10 @@ docstring Buffer::emergencyWrite()
                LYXERR0("  " << s);
                if (writeFile(FileName(s))) {
                        markClean();
-                       user_message += bformat(_("  Saved to %1$s. Phew.\n"), from_utf8(s));
+                       user_message += "  " + bformat(_("Saved to %1$s. Phew.\n"), from_utf8(s));
                        return user_message;
                } else {
-                       user_message += _("  Save failed! Trying again...\n");
+                       user_message += "  " + _("Save failed! Trying again...\n");
                }
        }
 
@@ -1115,11 +1152,11 @@ docstring Buffer::emergencyWrite()
        lyxerr << ' ' << s << endl;
        if (writeFile(FileName(s))) {
                markClean();
-               user_message += bformat(_("  Saved to %1$s. Phew.\n"), from_utf8(s));
+               user_message += "  " + bformat(_("Saved to %1$s. Phew.\n"), from_utf8(s));
                return user_message;
        }
 
-       user_message += _("  Save failed! Trying yet again...\n");
+       user_message += "  " + _("Save failed! Trying yet again...\n");
 
        // 3) In "/tmp" directory.
        // MakeAbsPath to prepend the current
@@ -1129,11 +1166,11 @@ docstring Buffer::emergencyWrite()
        lyxerr << ' ' << s << endl;
        if (writeFile(FileName(s))) {
                markClean();
-               user_message += bformat(_("  Saved to %1$s. Phew.\n"), from_utf8(s));
+               user_message += "  " + bformat(_("Saved to %1$s. Phew.\n"), from_utf8(s));
                return user_message;
        }
 
-       user_message += _("  Save failed! Bummer. Document is lost.");
+       user_message += "  " + _("Save failed! Bummer. Document is lost.");
        // Don't try again.
        markClean();
        return user_message;
@@ -1150,7 +1187,7 @@ bool Buffer::write(ostream & ofs) const
        // The top of the file should not be written by params().
 
        // write out a comment in the top of the file
-       ofs << "#LyX " << lyx_version
+       ofs << "#LyX " << lyx_version_major << "." << lyx_version_minor
            << " created this file. For more info see http://www.lyx.org/\n"
            << "\\lyxformat " << LYX_FORMAT << "\n"
            << "\\begin_document\n";
@@ -1207,8 +1244,11 @@ bool Buffer::makeLaTeXFile(FileName const & fname,
                           bool output_preamble, bool output_body) const
 {
        OutputParams runparams = runparams_in;
-       if (params().useXetex)
-               runparams.flavor = OutputParams::XETEX;
+
+       // This is necessary for LuaTeX/XeTeX with tex fonts.
+       // See FIXME in BufferParams::encoding()
+       if (runparams.isFullUnicode())
+               runparams.encoding = encodings.fromLyXName("utf8-plain");
 
        string const encoding = runparams.encoding->iconvName();
        LYXERR(Debug::LATEX, "makeLaTeXFile encoding: " << encoding << "...");
@@ -1229,9 +1269,10 @@ bool Buffer::makeLaTeXFile(FileName const & fname,
        ErrorList & errorList = d->errorLists["Export"];
        errorList.clear();
        bool failed_export = false;
+       otexstream os(ofs, d->texrow);
        try {
-               d->texrow.reset();
-               writeLaTeXSource(ofs, original_path,
+               os.texrow().reset();
+               writeLaTeXSource(os, original_path,
                      runparams, output_preamble, output_body);
        }
        catch (EncodingException & e) {
@@ -1274,7 +1315,7 @@ bool Buffer::makeLaTeXFile(FileName const & fname,
 }
 
 
-void Buffer::writeLaTeXSource(odocstream & os,
+void Buffer::writeLaTeXSource(otexstream & os,
                           string const & original_path,
                           OutputParams const & runparams_in,
                           bool const output_preamble, bool const output_body) const
@@ -1299,8 +1340,6 @@ void Buffer::writeLaTeXSource(odocstream & os,
                        "For more info, see http://www.lyx.org/.\n"
                        "%% Do not edit unless you really know what "
                        "you are doing.\n";
-               d->texrow.newline();
-               d->texrow.newline();
        }
        LYXERR(Debug::INFO, "lyx document header finished");
 
@@ -1326,9 +1365,7 @@ void Buffer::writeLaTeXSource(odocstream & os,
        if (output_preamble) {
                if (!runparams.nice) {
                        // code for usual, NOT nice-latex-file
-                       os << "\\batchmode\n"; // changed
-                       // from \nonstopmode
-                       d->texrow.newline();
+                       os << "\\batchmode\n"; // changed from \nonstopmode
                }
                if (!original_path.empty()) {
                        // FIXME UNICODE
@@ -1364,9 +1401,6 @@ void Buffer::writeLaTeXSource(odocstream & os,
                                   << "\\def\\input@path{{"
                                   << inputpath << "/}}\n"
                                   << "\\makeatother\n";
-                               d->texrow.newline();
-                               d->texrow.newline();
-                               d->texrow.newline();
                        }
                }
 
@@ -1375,9 +1409,9 @@ void Buffer::writeLaTeXSource(odocstream & os,
                MacroSet parentMacros;
                listParentMacros(parentMacros, features);
 
+               runparams.use_polyglossia = features.usePolyglossia();
                // Write the preamble
                runparams.use_babel = params().writeLaTeX(os, features,
-                                                         d->texrow,
                                                          d->filename.onlyPath());
 
                runparams.use_japanese = features.isRequired("japanese");
@@ -1387,19 +1421,18 @@ void Buffer::writeLaTeXSource(odocstream & os,
 
                // make the body.
                os << "\\begin{document}\n";
-               d->texrow.newline();
 
                // output the parent macros
                MacroSet::iterator it = parentMacros.begin();
                MacroSet::iterator end = parentMacros.end();
                for (; it != end; ++it) {
-                       int num_lines = (*it)->write(os, true);
-                       d->texrow.newlines(num_lines);
+                       int num_lines = (*it)->write(os.os(), true);
+                       os.texrow().newlines(num_lines);
                }
                
        } // output_preamble
 
-       d->texrow.start(paragraphs().begin()->id(), 0);
+       os.texrow().start(paragraphs().begin()->id(), 0);
 
        LYXERR(Debug::INFO, "preamble finished, now the body.");
 
@@ -1413,7 +1446,7 @@ void Buffer::writeLaTeXSource(odocstream & os,
        }
 
        // the real stuff
-       latexParagraphs(*this, text(), os, d->texrow, runparams);
+       latexParagraphs(*this, text(), os, runparams);
 
        // Restore the parenthood if needed
        if (output_preamble)
@@ -1421,11 +1454,9 @@ void Buffer::writeLaTeXSource(odocstream & os,
 
        // add this just in case after all the paragraphs
        os << endl;
-       d->texrow.newline();
 
        if (output_preamble) {
                os << "\\end{document}\n";
-               d->texrow.newline();
                LYXERR(Debug::LATEX, "makeLaTeXFile...done");
        } else {
                LYXERR(Debug::LATEX, "LaTeXFile for inclusion made.");
@@ -1433,7 +1464,7 @@ void Buffer::writeLaTeXSource(odocstream & os,
        runparams_in.encoding = runparams.encoding;
 
        // Just to be sure. (Asger)
-       d->texrow.newline();
+       os.texrow().newline();
 
        //for (int i = 0; i<d->texrow.rows(); i++) {
        // int id,pos;
@@ -1442,7 +1473,7 @@ void Buffer::writeLaTeXSource(odocstream & os,
        //}
 
        LYXERR(Debug::INFO, "Finished making LaTeX file.");
-       LYXERR(Debug::INFO, "Row count was " << d->texrow.rows() - 1 << '.');
+       LYXERR(Debug::INFO, "Row count was " << os.texrow().rows() - 1 << '.');
 }
 
 
@@ -1603,7 +1634,7 @@ void Buffer::writeLyXHTMLSource(odocstream & os,
 
                os << "\n<!-- Text Class Preamble -->\n"
                   << features.getTClassHTMLPreamble()
-                  << "\n<!-- Premable Snippets -->\n"
+                  << "\n<!-- Preamble Snippets -->\n"
                   << from_utf8(features.getPreambleSnippets());
 
                os << "\n<!-- Layout-provided Styles -->\n";
@@ -1712,15 +1743,13 @@ void Buffer::updateBibfilesCache(UpdateScope scope) const
        d->bibfiles_cache_.clear();
        for (InsetIterator it = inset_iterator_begin(inset()); it; ++it) {
                if (it->lyxCode() == BIBTEX_CODE) {
-                       InsetBibtex const & inset =
-                               static_cast<InsetBibtex const &>(*it);
+                       InsetBibtex const & inset = static_cast<InsetBibtex const &>(*it);
                        support::FileNameList const bibfiles = inset.getBibFiles();
                        d->bibfiles_cache_.insert(d->bibfiles_cache_.end(),
                                bibfiles.begin(),
                                bibfiles.end());
                } else if (it->lyxCode() == INCLUDE_CODE) {
-                       InsetInclude & inset =
-                               static_cast<InsetInclude &>(*it);
+                       InsetInclude & inset = static_cast<InsetInclude &>(*it);
                        Buffer const * const incbuf = inset.getChildBuffer();
                        if (!incbuf)
                                continue;
@@ -1783,21 +1812,19 @@ BiblioInfo const & Buffer::masterBibInfo() const
 }
 
 
-void Buffer::checkBibInfoCache() const 
+void Buffer::checkIfBibInfoCacheIsValid() const
 {
        // use the master's cache
        Buffer const * const tmp = masterBuffer();
        if (tmp != this) {
-               tmp->checkBibInfoCache();
+               tmp->checkIfBibInfoCacheIsValid();
                return;
        }
 
-       // this will also reload the cache if it is invalid 
-       support::FileNameList const & bibfiles_cache = getBibfilesCache();
-       
        // compare the cached timestamps with the actual ones.
-       support::FileNameList::const_iterator ei = bibfiles_cache.begin();
-       support::FileNameList::const_iterator en = bibfiles_cache.end();
+       FileNameList const & bibfiles_cache = getBibfilesCache();
+       FileNameList::const_iterator ei = bibfiles_cache.begin();
+       FileNameList::const_iterator en = bibfiles_cache.end();
        for (; ei != en; ++ ei) {
                time_t lastw = ei->lastModified();
                time_t prevw = d->bibfile_status_[*ei];
@@ -1806,20 +1833,50 @@ void Buffer::checkBibInfoCache() const
                        d->bibfile_status_[*ei] = lastw;
                }
        }
-       
-       // if not valid, then reload the info
-       if (!d->bibinfo_cache_valid_) {
-               d->bibinfo_.clear();
-               fillWithBibKeys(d->bibinfo_);
-               d->bibinfo_cache_valid_ = true;
+}
+
+
+void Buffer::reloadBibInfoCache() const
+{
+       // use the master's cache
+       Buffer const * const tmp = masterBuffer();
+       if (tmp != this) {
+               tmp->reloadBibInfoCache();
+               return;
        }
+
+       checkIfBibInfoCacheIsValid();
+       if (d->bibinfo_cache_valid_)
+               return;
+
+       d->bibinfo_.clear();
+       collectBibKeys();
+       d->bibinfo_cache_valid_ = true;
 }
 
 
-void Buffer::fillWithBibKeys(BiblioInfo & keys) const
+void Buffer::collectBibKeys() const
 {
        for (InsetIterator it = inset_iterator_begin(inset()); it; ++it)
-               it->fillWithBibKeys(keys, it);
+               it->collectBibKeys(it);
+}
+
+
+void Buffer::addBiblioInfo(BiblioInfo const & bi) const
+{
+       Buffer const * tmp = masterBuffer();
+       BiblioInfo & masterbi = (tmp == this) ?
+               d->bibinfo_ : tmp->d->bibinfo_;
+       masterbi.mergeBiblioInfo(bi);
+}
+
+
+void Buffer::addBibTeXInfo(docstring const & key, BibTeXInfo const & bi) const
+{
+       Buffer const * tmp = masterBuffer();
+       BiblioInfo & masterbi = (tmp == this) ?
+               d->bibinfo_ : tmp->d->bibinfo_;
+       masterbi[key] = bi;
 }
 
 
@@ -2017,6 +2074,7 @@ void Buffer::dispatch(FuncRequest const & func, DispatchResult & dr)
 
        case LFUN_BUFFER_AUTO_SAVE:
                autoSave();
+               resetAutosaveTimers();
                break;
 
        case LFUN_BRANCH_ADD: {
@@ -2376,8 +2434,11 @@ bool Buffer::isExternallyModified(CheckMethod method) const
 }
 
 
-void Buffer::saveCheckSum(FileName const & file) const
+void Buffer::saveCheckSum() const
 {
+       FileName const & file = d->filename;
+
+       file.refresh();
        if (file.exists()) {
                d->timestamp_ = file.lastModified();
                d->checksum_ = file.checksum();
@@ -2623,7 +2684,9 @@ MacroData const * Buffer::Impl::getBufferMacro(docstring const & name,
                        break;
 
                // scope ends behind pos?
-               if (pos < it->second.first) {
+               if (pos < it->second.first
+                       && (cloned_buffer_ ||
+                           theBufferList().isLoaded(it->second.second))) {
                        // look for macro in external file
                        macro_lock = true;
                        MacroData const * data
@@ -2767,12 +2830,11 @@ void Buffer::Impl::updateMacros(DocIterator & it, DocIterator & scope)
                                continue;
                        }
 
-                       if (doing_export && iit->inset->asInsetMath()) {
-                               InsetMath * im = static_cast<InsetMath *>(iit->inset);
-                               if (im->asHullInset()) {
-                                       InsetMathHull * hull = static_cast<InsetMathHull *>(im);
+                       InsetMath * im = iit->inset->asInsetMath();
+                       if (doing_export && im)  {
+                               InsetMathHull * hull = im->asHullInset();
+                               if (hull)
                                        hull->recordLocation(it);
-                               }
                        }
 
                        if (iit->inset->lyxCode() != MATHMACRO_CODE)
@@ -2780,7 +2842,7 @@ void Buffer::Impl::updateMacros(DocIterator & it, DocIterator & scope)
 
                        // get macro data
                        MathMacroTemplate & macroTemplate =
-                               static_cast<MathMacroTemplate &>(*iit->inset);
+                               *iit->inset->asInsetMath()->asMacroTemplate();
                        MacroContext mc(owner_, it);
                        macroTemplate.updateToContext(mc);
 
@@ -2986,40 +3048,43 @@ void Buffer::changeRefsIfUnique(docstring const & from, docstring const & to,
 {
        //FIXME: This does not work for child documents yet.
        LASSERT(code == CITE_CODE, /**/);
+
+       reloadBibInfoCache();
+
        // Check if the label 'from' appears more than once
-       vector<docstring> labels;
-       string paramName;
-       checkBibInfoCache();
        BiblioInfo const & keys = masterBibInfo();
        BiblioInfo::const_iterator bit  = keys.begin();
        BiblioInfo::const_iterator bend = keys.end();
+       vector<docstring> labels;
 
        for (; bit != bend; ++bit)
                // FIXME UNICODE
                labels.push_back(bit->first);
-       paramName = "key";
 
        if (count(labels.begin(), labels.end(), from) > 1)
                return;
 
+       string const paramName = "key";
        for (InsetIterator it = inset_iterator_begin(inset()); it; ++it) {
                if (it->lyxCode() == code) {
-                       InsetCommand & inset = static_cast<InsetCommand &>(*it);
-                       docstring const oldValue = inset.getParam(paramName);
+                       InsetCommand * inset = it->asInsetCommand();
+                       if (!inset)
+                               continue;
+                       docstring const oldValue = inset->getParam(paramName);
                        if (oldValue == from)
-                               inset.setParam(paramName, to);
+                               inset->setParam(paramName, to);
                }
        }
 }
 
 
-void Buffer::getSourceCode(odocstream & os, pit_type par_begin,
-       pit_type par_end, bool full_source) const
+void Buffer::getSourceCode(odocstream & os, string const format,
+                          pit_type par_begin, pit_type par_end,
+                          bool full_source) const
 {
        OutputParams runparams(&params().encoding());
        runparams.nice = true;
-       runparams.flavor = params().useXetex ? 
-               OutputParams::XETEX : OutputParams::LATEX;
+       runparams.flavor = getOutputFlavor(format);
        runparams.linelen = lyxrc.plaintext_linelen;
        // No side effect of file copying and image conversion
        runparams.dryrun = true;
@@ -3031,9 +3096,13 @@ void Buffer::getSourceCode(odocstream & os, pit_type par_begin,
                d->texrow.newline();
                if (isDocBook())
                        writeDocBookSource(os, absFileName(), runparams, false);
-               else
+               else if (runparams.flavor == OutputParams::HTML)
+                       writeLyXHTMLSource(os, runparams, false);
+               else {
                        // latex or literate
-                       writeLaTeXSource(os, string(), runparams, true, true);
+                       otexstream ots(os, d->texrow);
+                       writeLaTeXSource(ots, string(), runparams, true, true);
+               }
        } else {
                runparams.par_begin = par_begin;
                runparams.par_end = par_end;
@@ -3055,9 +3124,14 @@ void Buffer::getSourceCode(odocstream & os, pit_type par_begin,
                // output paragraphs
                if (isDocBook())
                        docbookParagraphs(text(), *this, os, runparams);
-               else 
+               else if (runparams.flavor == OutputParams::HTML) {
+                       XHTMLStream xs(os);
+                       xhtmlParagraphs(text(), *this, xs, runparams);
+               } else {
                        // latex or literate
-                       latexParagraphs(*this, text(), os, texrow, runparams);
+                       otexstream ots(os, texrow);
+                       latexParagraphs(*this, text(), ots, runparams);
+               }
        }
 }
 
@@ -3218,6 +3292,12 @@ int AutoSaveBuffer::generateChild()
 } // namespace anon
 
 
+FileName Buffer::getEmergencyFileName() const
+{
+       return FileName(d->filename.absFileName() + ".emergency");
+}
+
+
 FileName Buffer::getAutosaveFileName() const
 {
        // if the document is unnamed try to save in the backup dir, else
@@ -3231,6 +3311,7 @@ FileName Buffer::getAutosaveFileName() const
                fpath = filePath();
 
        string const fname = "#" + d->filename.onlyFileName() + "#";
+
        return makeAbsPath(fname, fpath);
 }
 
@@ -3253,23 +3334,36 @@ void Buffer::moveAutosaveFile(support::FileName const & oldauto) const
 }
 
 
-// Perfect target for a thread...
-void Buffer::autoSave() const
+bool Buffer::autoSave() const 
 {
-       if (d->bak_clean || isReadonly()) {
-               // We don't save now, but we'll try again later
-               resetAutosaveTimers();
-               return;
-       }
+       Buffer const * buf = d->cloned_buffer_ ? d->cloned_buffer_ : this;
+       if (buf->d->bak_clean || isReadonly())
+               return true;
 
-       // emit message signal.
        message(_("Autosaving current document..."));
-       AutoSaveBuffer autosave(*this, getAutosaveFileName());
-       autosave.start();
-
-       d->bak_clean = true;
-
-       resetAutosaveTimers();
+       buf->d->bak_clean = true;
+       
+       FileName const fname = getAutosaveFileName();
+       if (d->cloned_buffer_) {
+               // If this buffer is cloned, we assume that
+               // we are running in a separate thread already.
+               FileName const tmp_ret = FileName::tempName("lyxauto");
+               if (!tmp_ret.empty()) {
+                       writeFile(tmp_ret);
+                       // assume successful write of tmp_ret
+                       if (tmp_ret.moveTo(fname))
+                               return true;
+               }
+               // failed to write/rename tmp_ret so try writing direct
+               return writeFile(fname);
+       } else {        
+               /// This function is deprecated as the frontend needs to take care
+               /// of cloning the buffer and autosaving it in another thread. It
+               /// is still here to allow (QT_VERSION < 0x040400).
+               AutoSaveBuffer autosave(*this, fname);
+               autosave.start();
+               return true;
+       }
 }
 
 
@@ -3277,7 +3371,7 @@ string Buffer::bufferFormat() const
 {
        string format = params().documentClass().outputFormat();
        if (format == "latex") {
-               if (params().useXetex)
+               if (params().useNonTeXFonts)
                        return "xetex";
                if (params().encoding().package() == Encoding::japanese)
                        return "platex";
@@ -3288,15 +3382,13 @@ string Buffer::bufferFormat() const
 
 string Buffer::getDefaultOutputFormat() const
 {
-       if (!params().defaultOutputFormat.empty()
-           && params().defaultOutputFormat != "default")
-               return params().defaultOutputFormat;
-       typedef vector<Format const *> Formats;
-       Formats formats = exportableFormats(true);
+       if (!params().default_output_format.empty()
+           && params().default_output_format != "default")
+               return params().default_output_format;
        if (isDocBook()
-           || isLiterate()
-           || params().useXetex
+           || params().useNonTeXFonts
            || params().encoding().package() == Encoding::japanese) {
+               vector<Format const *> const formats = exportableFormats(true);
                if (formats.empty())
                        return string();
                // return the first we find
@@ -3306,6 +3398,43 @@ string Buffer::getDefaultOutputFormat() const
 }
 
 
+OutputParams::FLAVOR Buffer::getOutputFlavor(string const format) const
+{
+       string const dformat = (format.empty() || format == "default") ?
+               getDefaultOutputFormat() : format;
+       DefaultFlavorCache::const_iterator it =
+               default_flavors_.find(dformat);
+
+       if (it != default_flavors_.end())
+               return it->second;
+
+       OutputParams::FLAVOR result = OutputParams::LATEX;
+       
+       if (dformat == "xhtml")
+               result = OutputParams::HTML;
+       else {
+               // Try to determine flavor of default output format
+               vector<string> backs = backends();
+               if (find(backs.begin(), backs.end(), dformat) == backs.end()) {
+                       // Get shortest path to format
+                       Graph::EdgePath path;
+                       for (vector<string>::const_iterator it = backs.begin();
+                           it != backs.end(); ++it) {
+                               Graph::EdgePath p = theConverters().getPath(*it, dformat);
+                               if (!p.empty() && (path.empty() || p.size() < path.size())) {
+                                       path = p;
+                               }
+                       }
+                       if (!path.empty())
+                               result = theConverters().getFlavor(path);
+               }
+       }
+       // cache this flavor
+       default_flavors_[dformat] = result;
+       return result;
+}
+
+
 namespace {
        // helper class, to guarantee this gets reset properly
        class MarkAsExporting   {
@@ -3347,12 +3476,14 @@ bool Buffer::doExport(string const & format, bool put_in_tempdir,
        runparams.linelen = lyxrc.plaintext_linelen;
        runparams.includeall = includeall;
        vector<string> backs = backends();
+       Converters converters = theConverters();
        if (find(backs.begin(), backs.end(), format) == backs.end()) {
                // Get shortest path to format
+               converters.buildGraph();
                Graph::EdgePath path;
                for (vector<string>::const_iterator it = backs.begin();
                     it != backs.end(); ++it) {
-                       Graph::EdgePath p = theConverters().getPath(*it, format);
+                       Graph::EdgePath p = converters.getPath(*it, format);
                        if (!p.empty() && (path.empty() || p.size() < path.size())) {
                                backend_format = *it;
                                path = p;
@@ -3368,13 +3499,17 @@ bool Buffer::doExport(string const & format, bool put_in_tempdir,
                        }
                        return false;
                }
-               runparams.flavor = theConverters().getFlavor(path);
+               runparams.flavor = converters.getFlavor(path);
 
        } else {
                backend_format = format;
                // FIXME: Don't hardcode format names here, but use a flag
                if (backend_format == "pdflatex")
                        runparams.flavor = OutputParams::PDFLATEX;
+               else if (backend_format == "luatex")
+                       runparams.flavor = OutputParams::LUATEX;
+               else if (backend_format == "xetex")
+                       runparams.flavor = OutputParams::XETEX;
        }
 
        string filename = latexName(false);
@@ -3405,11 +3540,10 @@ bool Buffer::doExport(string const & format, bool put_in_tempdir,
                        break;
                case BufferParams::LaTeX:
                        runparams.math_flavor = OutputParams::MathAsLaTeX; 
-                       break;                                                                                  
+                       break;
                }
-               
                makeLyXHTMLFile(FileName(filename), runparams);
-       }       else if (backend_format == "lyx")
+       } else if (backend_format == "lyx")
                writeFile(FileName(filename));
        // Docbook backend
        else if (isDocBook()) {
@@ -3419,8 +3553,13 @@ bool Buffer::doExport(string const & format, bool put_in_tempdir,
        // LaTeX backend
        else if (backend_format == format) {
                runparams.nice = true;
-               if (!makeLaTeXFile(FileName(filename), string(), runparams))
+               if (!makeLaTeXFile(FileName(filename), string(), runparams)) {
+                       if (d->cloned_buffer_) {
+                               d->cloned_buffer_->d->errorLists["Export"] =
+                                       d->errorLists["Export"];
+                       }
                        return false;
+               }
        } else if (!lyxrc.tex_allows_spaces
                   && contains(filePath(), ' ')) {
                Alert::error(_("File name error"),
@@ -3428,8 +3567,13 @@ bool Buffer::doExport(string const & format, bool put_in_tempdir,
                return false;
        } else {
                runparams.nice = false;
-               if (!makeLaTeXFile(FileName(filename), filePath(), runparams))
+               if (!makeLaTeXFile(FileName(filename), filePath(), runparams)) {
+                       if (d->cloned_buffer_) {
+                               d->cloned_buffer_->d->errorLists["Export"] =
+                                       d->errorLists["Export"];
+                       }
                        return false;
+               }
        }
 
        string const error_type = (format == "program")
@@ -3437,12 +3581,12 @@ bool Buffer::doExport(string const & format, bool put_in_tempdir,
        ErrorList & error_list = d->errorLists[error_type];
        string const ext = formats.extension(format);
        FileName const tmp_result_file(changeExtension(filename, ext));
-       bool const success = theConverters().convert(this, FileName(filename),
+       bool const success = converters.convert(this, FileName(filename),
                tmp_result_file, FileName(absFileName()), backend_format, format,
                error_list);
 
        // Emit the signal to show the error list or copy it back to the
-       // cloned Buffer so that it cab be emitted afterwards.
+       // cloned Buffer so that it can be emitted afterwards.
        if (format != backend_format) {
                if (d->cloned_buffer_) {
                        d->cloned_buffer_->d->errorLists[error_type] = 
@@ -3455,6 +3599,10 @@ bool Buffer::doExport(string const & format, bool put_in_tempdir,
                ListOfBuffers::const_iterator const cen = clist.end();
                for (; cit != cen; ++cit) {
                        if (d->cloned_buffer_) {
+                               // Enable reverse search by copying back the
+                               // texrow object to the cloned buffer.
+                               // FIXME: this is not thread safe.
+                               (*cit)->d->cloned_buffer_->d->texrow = (*cit)->d->texrow;
                                (*cit)->d->cloned_buffer_->d->errorLists[error_type] = 
                                        (*cit)->d->errorLists[error_type];
                        } else
@@ -3581,8 +3729,12 @@ vector<string> Buffer::backends() const
        vector<string> v;
        v.push_back(bufferFormat());
        // FIXME: Don't hardcode format names here, but use a flag
-       if (v.back() == "latex")
+       if (v.back() == "latex") {
                v.push_back("pdflatex");
+               v.push_back("luatex");
+               v.push_back("xetex");
+       } else if (v.back() == "xetex")
+               v.push_back("luatex");
        v.push_back("xhtml");
        v.push_back("text");
        v.push_back("lyx");
@@ -3590,109 +3742,147 @@ vector<string> Buffer::backends() const
 }
 
 
-bool Buffer::readFileHelper(FileName const & s)
+Buffer::ReadStatus Buffer::extractFromVC()
 {
-       // File information about normal file
-       if (!s.exists()) {
-               docstring const file = makeDisplayPath(s.absFileName(), 50);
-               docstring text = bformat(_("The specified document\n%1$s"
-                                                    "\ncould not be read."), file);
-               Alert::error(_("Could not read document"), text);
-               return false;
-       }
+       bool const found = LyXVC::file_not_found_hook(d->filename);
+       if (!found)
+               return ReadFileNotFound;
+       if (!d->filename.isReadableFile())
+               return ReadVCError;
+       return ReadSuccess;
+}
 
-       // Check if emergency save file exists and is newer.
-       FileName const e(s.absFileName() + ".emergency");
-
-       if (e.exists() && s.exists() && e.lastModified() > s.lastModified()) {
-               docstring const file = makeDisplayPath(s.absFileName(), 20);
-               docstring const text =
-                       bformat(_("An emergency save of the document "
-                                 "%1$s exists.\n\n"
-                                              "Recover emergency save?"), file);
-               switch (Alert::prompt(_("Load emergency save?"), text, 0, 2,
-                                     _("&Recover"),  _("&Load Original"),
-                                     _("&Cancel")))
-               {
-               case 0: {
-                       // the file is not saved if we load the emergency file.
+
+Buffer::ReadStatus Buffer::loadEmergency()
+{
+       FileName const emergencyFile = getEmergencyFileName();
+       if (!emergencyFile.exists() 
+                 || emergencyFile.lastModified() <= d->filename.lastModified())
+               return ReadFileNotFound;
+
+       docstring const file = makeDisplayPath(d->filename.absFileName(), 20);
+       docstring const text = bformat(_("An emergency save of the document "
+               "%1$s exists.\n\nRecover emergency save?"), file);
+       
+       int const load_emerg = Alert::prompt(_("Load emergency save?"), text,
+               0, 2, _("&Recover"), _("&Load Original"), _("&Cancel"));
+
+       switch (load_emerg)
+       {
+       case 0: {
+               docstring str;
+               ReadStatus const ret_llf = loadThisLyXFile(emergencyFile);
+               bool const success = (ret_llf == ReadSuccess);
+               if (success) {
+                       if (isReadonly()) {
+                               Alert::warning(_("File is read-only"),
+                                       bformat(_("An emergency file is successfully loaded, "
+                                       "but the original file %1$s is marked read-only. "
+                                       "Please make sure to save the document as a different "
+                                       "file."), from_utf8(d->filename.absFileName())));
+                       }
                        markDirty();
-                       docstring str;
-                       bool res;
-
-                       if ((res = readFile(e)) == success)
-                               str = _("Document was successfully recovered.");
-                       else
-                               str = _("Document was NOT successfully recovered.");
-                       str += "\n\n" + bformat(_("Remove emergency file now?\n(%1$s)"),
-                                               makeDisplayPath(e.absFileName()));
-
-                       if (!Alert::prompt(_("Delete emergency file?"), str, 1, 1,
-                                       _("&Remove"), _("&Keep it"))) {
-                               e.removeFile();
-                               if (res == success)
-                                       Alert::warning(_("Emergency file deleted"),
-                                               _("Do not forget to save your file now!"), true);
-                               }
-                       return res;
-               }
-               case 1:
-                       if (!Alert::prompt(_("Delete emergency file?"),
-                                       _("Remove emergency file now?"), 1, 1,
-                                       _("&Remove"), _("&Keep it")))
-                               e.removeFile();
-                       break;
-               default:
-                       return false;
-               }
+                       str = _("Document was successfully recovered.");
+               } else
+                       str = _("Document was NOT successfully recovered.");
+               str += "\n\n" + bformat(_("Remove emergency file now?\n(%1$s)"),
+                       makeDisplayPath(emergencyFile.absFileName()));
+
+               int const del_emerg = 
+                       Alert::prompt(_("Delete emergency file?"), str, 1, 1,
+                               _("&Remove"), _("&Keep"));
+               if (del_emerg == 0) {
+                       emergencyFile.removeFile();
+                       if (success)
+                               Alert::warning(_("Emergency file deleted"),
+                                       _("Do not forget to save your file now!"), true);
+                       }
+               return success ? ReadSuccess : ReadEmergencyFailure;
        }
+       case 1: {
+               int const del_emerg =
+                       Alert::prompt(_("Delete emergency file?"),
+                               _("Remove emergency file now?"), 1, 1,
+                               _("&Remove"), _("&Keep"));
+               if (del_emerg == 0)
+                       emergencyFile.removeFile();
+               return ReadOriginal;
+       }
+
+       default:
+               break;
+       }
+       return ReadCancel;
+}
+
 
+Buffer::ReadStatus Buffer::loadAutosave()
+{
        // Now check if autosave file is newer.
-       FileName const a(onlyPath(s.absFileName()) + '#' + onlyFileName(s.absFileName()) + '#');
-
-       if (a.exists() && s.exists() && a.lastModified() > s.lastModified()) {
-               docstring const file = makeDisplayPath(s.absFileName(), 20);
-               docstring const text =
-                       bformat(_("The backup of the document "
-                                 "%1$s is newer.\n\nLoad the "
-                                              "backup instead?"), file);
-               switch (Alert::prompt(_("Load backup?"), text, 0, 2,
-                                     _("&Load backup"), _("Load &original"),
-                                     _("&Cancel") ))
-               {
-               case 0:
-                       // the file is not saved if we load the autosave file.
+       FileName const autosaveFile = getAutosaveFileName();
+       if (!autosaveFile.exists() 
+                 || autosaveFile.lastModified() <= d->filename.lastModified()) 
+               return ReadFileNotFound;
+
+       docstring const file = makeDisplayPath(d->filename.absFileName(), 20);
+       docstring const text = bformat(_("The backup of the document %1$s " 
+               "is newer.\n\nLoad the backup instead?"), file);
+       int const ret = Alert::prompt(_("Load backup?"), text, 0, 2,
+               _("&Load backup"), _("Load &original"), _("&Cancel"));
+       
+       switch (ret)
+       {
+       case 0: {
+               ReadStatus const ret_llf = loadThisLyXFile(autosaveFile);
+               // the file is not saved if we load the autosave file.
+               if (ret_llf == ReadSuccess) {
+                       if (isReadonly()) {
+                               Alert::warning(_("File is read-only"),
+                                       bformat(_("A backup file is successfully loaded, "
+                                       "but the original file %1$s is marked read-only. "
+                                       "Please make sure to save the document as a "
+                                       "different file."), 
+                                       from_utf8(d->filename.absFileName())));
+                       }
                        markDirty();
-                       return readFile(a);
-               case 1:
-                       // Here we delete the autosave
-                       a.removeFile();
-                       break;
-               default:
-                       return false;
+                       return ReadSuccess;
                }
+               return ReadAutosaveFailure;
+       }
+       case 1:
+               // Here we delete the autosave
+               autosaveFile.removeFile();
+               return ReadOriginal;
+       default:
+               break;
        }
-       return readFile(s);
+       return ReadCancel;
 }
 
 
-bool Buffer::loadLyXFile(FileName const & s)
+Buffer::ReadStatus Buffer::loadLyXFile()
 {
-       // If the file is not readable, we try to
-       // retrieve the file from version control.
-       if (!s.isReadableFile()
-                 && !LyXVC::file_not_found_hook(s))
-               return false;
-       
-       if (s.isReadableFile()){
-               // InsetInfo needs to know if file is under VCS
-               lyxvc().file_found_hook(s);
-               if (readFileHelper(s)) {
-                       d->read_only = !s.isWritable();
-                       return true;
-               }
+       if (!d->filename.isReadableFile()) {
+               ReadStatus const ret_rvc = extractFromVC();
+               if (ret_rvc != ReadSuccess)
+                       return ret_rvc;
        }
-       return false;
+
+       ReadStatus const ret_re = loadEmergency();
+       if (ret_re == ReadSuccess || ret_re == ReadCancel)
+               return ret_re;
+       
+       ReadStatus const ret_ra = loadAutosave();
+       if (ret_ra == ReadSuccess || ret_ra == ReadCancel)
+               return ret_ra;
+
+       return loadThisLyXFile(d->filename);
+}
+
+
+Buffer::ReadStatus Buffer::loadThisLyXFile(FileName const & fn)
+{
+       return readFile(fn);
 }
 
 
@@ -3734,7 +3924,7 @@ void Buffer::updateBuffer(UpdateScope scope, UpdateType utype) const
        
        // do this only if we are the top-level Buffer
        if (master == this)
-               checkBibInfoCache();
+               reloadBibInfoCache();
 
        // keep the buffers to be children in this set. If the call from the
        // master comes back we can see which of them were actually seen (i.e.
@@ -3778,6 +3968,7 @@ void Buffer::updateBuffer(UpdateScope scope, UpdateType utype) const
                // TocBackend update will be done later.
                return;
 
+       d->bibinfo_cache_valid_ = true;
        cbuf.tocBackend().update();
        if (scope == UpdateMaster)
                cbuf.structureChanged();
@@ -3884,11 +4075,11 @@ void Buffer::Impl::setLabel(ParIterator & it, UpdateType utype) const
        switch(layout.labeltype) {
        case LABEL_COUNTER:
                if (layout.toclevel <= bp.secnumdepth
-                   && (layout.latextype != LATEX_ENVIRONMENT
-                       || it.text()->isFirstInSequence(it.pit()))) {
-                       counters.step(layout.counter, utype);
-                       par.params().labelString(
-                               par.expandLabel(layout, bp));
+                     && (layout.latextype != LATEX_ENVIRONMENT
+                         || it.text()->isFirstInSequence(it.pit()))) {
+                       if (counters.hasCounter(layout.counter))
+                               counters.step(layout.counter, utype);
+                       par.params().labelString(par.expandLabel(layout, bp));
                } else
                        par.params().labelString(docstring());
                break;
@@ -4058,32 +4249,63 @@ int Buffer::spellCheck(DocIterator & from, DocIterator & to,
 }
 
 
-bool Buffer::reload()
+Buffer::ReadStatus Buffer::reload()
 {
        setBusy(true);
-       // c.f. bug 6587
+       // c.f. bug http://www.lyx.org/trac/ticket/6587
        removeAutosaveFile();
        // e.g., read-only status could have changed due to version control
        d->filename.refresh();
        docstring const disp_fn = makeDisplayPath(d->filename.absFileName());
 
-       bool const success = loadLyXFile(d->filename);
-       if (success) {
+       ReadStatus const status = loadLyXFile();
+       if (status == ReadSuccess) {
                updateBuffer();
                changed(true);
                updateTitles();
                markClean();
-               saveCheckSum(d->filename);
                message(bformat(_("Document %1$s reloaded."), disp_fn));
+               d->undo_.clear();
        } else {
                message(bformat(_("Could not reload document %1$s."), disp_fn));
        }       
        setBusy(false);
-       thePreviews().removeLoader(*this);
-       if (graphics::Previews::status() != LyXRC::PREVIEW_OFF)
-               thePreviews().generateBufferPreviews(*this);
+       removePreviews();
+       updatePreviews();
        errors("Parse");
-       return success;
+       return status;
+}
+
+
+bool Buffer::saveAs(FileName const & fn)
+{
+       FileName const old_name = fileName();
+       FileName const old_auto = getAutosaveFileName();
+       bool const old_unnamed = isUnnamed();
+
+       setFileName(fn);
+       markDirty();
+       setUnnamed(false);
+
+       if (save()) {
+               // bring the autosave file with us, just in case.
+               moveAutosaveFile(old_auto);
+               // validate version control data and
+               // correct buffer title
+               lyxvc().file_found_hook(fileName());
+               updateTitles();
+               // the file has now been saved to the new location.
+               // we need to check that the locations of child buffers
+               // are still valid.
+               checkChildBuffers();
+               return true;
+       } else {
+               // save failed
+               // reset the old filename and unnamed state
+               setFileName(old_name);
+               setUnnamed(old_unnamed);
+               return false;
+       }
 }